Use coupon : RECHARGE

https://www.mobikwik.com/offers/rechargeandbills/recharge
Minimum amount spend to redeem the cashback is Rs.10
Maximum cashback is fixed at Rs.350
The code can be Redeemed twice per user
Coupon redemption & Payment should be done on MobiKwik’s Android, Windows (version 10 or above), iOS App or website.
Offer is valid for All MobiKwik users on All operators except AIRTEL.
Cashback will be processed within 24 hours.
Offer is valid till 30th September.